or if you want the large crystal, here's what I do:
(tip: this works best if you get an umbrella on 42, or find a shield.)
anyway, go to where the lower lemon is and kick a bomb through the teleporter, killing the higher lemon (if you don't have a shield, do a very careful bomb jump over the bottom lemon).
turn around, kill the other lemon.
go back through the teleporter, kill the apple/tomato that's there.
once again go through the teleporter, jump up to the small block, jump onto the ledge to the right of the block, then jump again and kill the applemato that's above the ledge.
I think you should be able to figure it out from there.
